We found this circuit in a 1998 publication. The circuit has controls for both frequency and signal strength. A lamp is used to monitor the signals. The supply is made with a voltage of 12 V.
We have in the figure a traditional amplifier configuration with operational amplifier. The source...
This circuit can be used to test crystals from 1 to 20 MHz and also has an output to measure their...
Using a single Darlington phototransistor, this circuit drives a highly sensitive relay, for...